Remove the fruit from the heat, allow it to cool to room temperature. Purée approximately half the mixture in a food processor or blender - try to blend as much of the plums as possible, to reduce the skins. Return the blended fruit to the unpuréed half.

Blend the yogurt and milk to make it light and frothy, then whisk it into the fruit. Add mint. Chill until very cold.

Serve topped with slices of lime and/or kiwifruit.

I made this with cherries instead of cherry-plums, and it was fantastic!